Dump Value / Big Intercooler
Turbo Mini Forums

Anyone tryed them new bailys dumps value?? Whats everyone got ?? And What gives out the loudest sound?

Whats wrong with big intercoolers??

http://www.Zeemax.com

with big intercoolers, i belive you have more lag and a bigger potential for ppressure drop. have a search on intercoolers and have a read of anything written by turbodave, he seems to be the authority on this (and quite a few other) subjects....

Pete

And on the 7th day........... God created turbochargers!

I'm not an authority on Turbo Minis but I know a bit about heat exchangers.

The bigger your duty, the bigger the surface area you will need. You can minimise this by increasing turbulance, decreasing the thickness, thermal resistance of the unit or by tube design.

You either have packed channels, like a Vauxhall TD or Unpacked like quite a few large petrol designs.

The resistance arises where you try and stuff air down little tubes, the smaller you make the tubes, the more significant the resistance caused by restriction is at the head of the flow. This is a trade off against film thickness. If you have thin streams of charge in narrow channels, the film effect is less which means that the heat is more efficiently transferred to a cooler surface.

The duty (required amount of heat needed to be got rid of) is bigger for lairy petrol engines than diesel, so diesel designs are less critical, less quick to react and generally not capable of transferring large amounts of heat.

The reason being is that the diesel designs are often with packed channels. This is where you have big fat channels in the exchanger. This isn't conducive to good cooling air flow through the unit and the total area for heat exchange to take place, allthough the fat channels are filled with fins and between the channels are filled as well. This is a compact but not that great way of achieving a big area. But, these things are slow to react and not great at big duties as the available temperature diff is less. The things run hotter. They still do what they were designed for though. Adding to this, the residence time is slightly less.

Also, with a fat unit, the cooling air flowing through it is warmed and loses some of its potential for cooling (delta T).

Since I have a Bini Blower bolted where my alternator/dizzy is, I am limited for space seriously. The only thing I can get in there is a packed channel cooler. Will have to fin everything in order to make up the difference and have some bonnet louvers as well.

So, for a bigger duty.

Biggest area/thickness ratio. Thinnest possible metal used everywhere, thin channels to promote good flow through the unit. Not packed channel design. Once again, the design features will have probably been dealt with if you pick a donor with a similar duty and delta T required (RS Turbo??).

The heat exchangers which I was designing (a while ago) were considerably bigger, shell and tube jobs. Same principles though.

Bugger off, I'm getting there.

So, you buy a dump valVe becasue of the sound?? How childish is this?? Bou one that performs.

I would avoid the Bailey piston type dump valve, i've heard quite a few reports of the piston sticking due to fuel contamination.
As for big intercoolers increasing lag, i can't say i noticed any difference when i changed from a Renault 5 item to a big alloy front mounted one......



Phil.

Edited by Turbo Phil on 20th Nov, 2004.

WWW.TURBO-MINI.COM

Thanks Lads smooth phil

http://www.Zeemax.com

or you can have itso it fits behind the grille and still allows a 'pikeyfree' internal bonnet release.

turbo Dave - by the looks of you picture you are still using the original mini bonnet hinges. Does this mean you bonnet is flush with the bulkhead panel and not kicked up to let the hot air from the turbo out?
Thanks Dave

My brother used to run a bailey dump valve, and it used to stick - never a good look! I run a kevlar diaphragm one, with no problems at all. Its also damn loud, and lets be honest Mr.Vegard, nothing wrong with a bit of posing, if you got it, flaunt it!!

Hannibal: There are two ways we can do this: the easy way and the hard way. In a few minutes my friends and I are going to come down on you like your worst nightmare. You're gonna wish the Earth had opened up and swallowed you whole.
bad guy: What's the easy way?
Hannibal: That WAS the easy way.

Dave - correct my bonnet is as originally fitted when my mini came off the production line - with the exception of the ERA vent on the back!

http://www.manchester-minis.cwc.net/members/turbodave.htm

Thanks for that turbo Dae - I know i'm hi jacking someone elses's thread but is absolutley neccesary to kick the bonnet up or have an ERA vent, as I prefer the clean lines of a standard bonnet? Is there any way to get round this or maybe a compromise in between.

thanks
Dave

You can just drill large holes in the rear of the bonnet and not fit any vent or lift the rear of the bonnet...

HA
I fitted a baily just because it made a massive noise and scares the knickers of old ladys !!!
It really is funny seeing them at the bus stop with their apple catchers around their ankles !! Cooooooooooooooooooooor


seriously I have not had any probs with my baily ; and it sounds very childish bit very nice


My evo has a baily twin piston DV , that makes a much much quiter noise and sounds a bit like a rally car !

might as well add my intercooler to this
Simple install and the IC that most recomend isnt that right chaps ???? TD back me up ... er er er um um I still got the Sierra one in the garage perhaps that would have been better mumble mumble

Edited by b12 on 22nd Nov, 2004.

TurboLessTosser

Turbo Dave - large as in what size? anyone else done this? thanks Dave

well under my ERA vent i have two 40mm diameter holes.
Maybe you'd like to drill lots of smaller ones...

No hard or fast rule - you're just letting the hot air from around the turbo vent upwards and outwards, rather than upwards where it then circulates around the carb...

Just do what you think is right... Two 8mm holes will make no difference at all... 20 8mm holes in a nice pattern will look good and serve a purpose... OF course, it'll also let rain in!

have you got any pictures of thar wolfie?

I'm planning on a similar thing to what Wolfie has done
I just need to decide on a vent I like if only I cold get my hands on a pair of merc sprinter wings for the vents

if any ones interested halfords sell era type vents need to be ordered though 20 quid when i got mine

no longer a series, but still 1.3 turbo.